I'll confess, I am not really good at that thing called English, I only use the language functionality, never creatively. So, I'll apologise for the lack of clarity of how some of these things are written.
But, if you are a `grapher, you will notice a different panel on the right, when you go to your profile page. That panel on the right is supposed to be 'your photography' which comes with title, a description and most importantly your '75 address'.
What does it all mean? Well, I am not quite sure, but I can tell you something about that, '75 address'.
Initially when you become a 'grapher, your address is based on the number of seconds since the unix epoch (somewhere around january 1st 1970) to the moment your 'grapher profile is done.
If you are okay with your 75 address being something like: http://75.co.za/1234567890, then that's kewl, but if you want it to be easy to remember when you refer people to your 'graphy then you might want to change it.
So, on your profile page, on the right panel, click on update and the form should explain the rest.
If all is not as you want it to be, then holla back.